Question

Use regular expressions to describe all integer constants in Java. Java integer
constants can be in decimal, octal or hexadecimal notation. Octal constants are
made of a leading zero followed by digits from 0 to 7. Hexadecimal constants have
a prefix “0x” or “0X” followed by characters which are either digits or letters
from A to F, lower or upper case.

Answer 1

Regular expression -

It is used in the java to find the matching support.

The required regular expression is given below

^[0-9A-Fa-fxX]*$